AnsweredAssumed Answered

EMG signal diminishes using AD8221

Question asked by pratham on Mar 16, 2015
Latest reply on May 12, 2015 by ScottH


I have designed a fairly simple EMG circuit and it works fine when I give a sine input from signal generator, i.e, I can see a clear and steady sine wave at the output of AD8221 amp. When I connect the inputs to my muscle on my forearms, the signal is clearly visible before and then diminishes to zero over 3 to 4seconds. I am pretty sure that my muscles are not facing fatigue. May I know if there is anything that I missed?


My specifications-

bandwidth of the signal - 15 to 200 Hz

gain - 50

power supply - -2.5V, 2.5V dual supply

inputs - differential


Thank you.